package com.atguigu.lease.web.admin.service.impl;

import com.atguigu.lease.common.constant.RedisConstant;
import com.atguigu.lease.common.exception.LeaseException;
import com.atguigu.lease.common.result.ResultCodeEnum;
import com.atguigu.lease.common.utils.JwtUtil;
import com.atguigu.lease.model.entity.SystemUser;
import com.atguigu.lease.model.enums.BaseStatus;
import com.atguigu.lease.web.admin.service.LoginService;
import com.atguigu.lease.web.admin.service.SystemUserService;
import com.atguigu.lease.web.admin.vo.login.CaptchaVo;
import com.atguigu.lease.web.admin.vo.login.LoginVo;
import com.atguigu.lease.web.admin.vo.system.user.SystemUserInfoVo;
import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.wf.captcha.SpecCaptcha;
import org.apache.commons.codec.digest.DigestUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.data.redis.core.StringRedisTemplate;
import org.springframework.stereotype.Service;
import org.springframework.util.StringUtils;

import java.util.UUID;
import java.util.concurrent.TimeUnit;

@Service
public class LoginServiceImpl implements LoginService {

    @Autowired
    private StringRedisTemplate redisTemplate;

    @Autowired
    private SystemUserService systemUserService;

    /**
     * 获取图形验证码
     *
     * @return 图像验证码对象
     */
    @Override
    public CaptchaVo getCaptcha() {
        // 创建验证码实例并设置GIF验证码的宽、高、位数
        SpecCaptcha specCaptcha = new SpecCaptcha(130, 48, 4);
        // 设置类型，字母数字混合
        specCaptcha.setCharType(SpecCaptcha.TYPE_DEFAULT);

        // 获取验证码文本并转换为小写（不区分大小写）
        String code = specCaptcha.text().toLowerCase();
        // 生成Redis存储键：ADMIN_LOGIN_PREFIX + UUID保证唯一性
        // UUID.randomUUID()生成随机唯一标识符，避免键冲突
        String key = RedisConstant.ADMIN_LOGIN_PREFIX + UUID.randomUUID();
        // 将验证码转换为Base64编码的图片数据（前端可直接显示）
        // toBase64()方法将验证码图片转换为Base64字符串
        String image = specCaptcha.toBase64();
        // 将验证码文本存入Redis，设置过期时间
        // RedisConstant.ADMIN_LOGIN_CAPTCHA_TTL_SEC定义过期秒数（如60秒）
        redisTemplate.opsForValue().set(key, code, RedisConstant.ADMIN_LOGIN_CAPTCHA_TTL_SEC, TimeUnit.SECONDS);

        // 返回验证码VO对象，包含图片数据和Redis键
        return new CaptchaVo(image, key);
    }

    /**
     * 登录
     *
     * @param loginVo 登录信息
     * @return token
     */
    @Override
    public String login(LoginVo loginVo) {
        // 1. 判断是否输入验证码
        if (!StringUtils.hasText(loginVo.getCaptchaCode())) {
            throw new LeaseException(ResultCodeEnum.APP_LOGIN_CODE_EMPTY);
        }

        // 2. 校验验证码
        String code = redisTemplate.opsForValue().get(loginVo.getCaptchaKey());
        if (code == null) {
            throw new LeaseException(ResultCodeEnum.ADMIN_CAPTCHA_CODE_EXPIRED);
        }
        if (!code.equals(loginVo.getCaptchaCode().toLowerCase())) {
            throw new LeaseException(ResultCodeEnum.ADMIN_CAPTCHA_CODE_ERROR);
        }

        // 3. 校验用户是否存在
        LambdaQueryWrapper<SystemUser> queryWrapper = new LambdaQueryWrapper<>();
        queryWrapper.eq(SystemUser::getUsername, loginVo.getUsername());
        SystemUser systemUser = systemUserService.getOne(queryWrapper);
        if (systemUser == null) {
            throw new LeaseException(ResultCodeEnum.ADMIN_ACCOUNT_NOT_EXIST_ERROR);
        }

        // 4. 校验用户是否被禁用
        if (systemUser.getStatus() == BaseStatus.DISABLE) {
            throw new LeaseException(ResultCodeEnum.ADMIN_ACCOUNT_DISABLED_ERROR);
        }

        // 5. 校验用户密码
        if (!systemUser.getPassword().equals(DigestUtils.sha256Hex(loginVo.getPassword()))) {
            throw new LeaseException(ResultCodeEnum.ADMIN_ACCOUNT_ERROR);
        }

        return JwtUtil.createToken(systemUser.getId(), systemUser.getUsername());
    }

    /**
     * 获取登陆用户个人信息
     *
     * @param userId 登录用户id
     * @return 用户信息
     */
    @Override
    public SystemUserInfoVo getSystemInfoById(Long userId) {
        SystemUser systemUser = systemUserService.getById(userId);
        SystemUserInfoVo systemUserInfoVo = new SystemUserInfoVo();
        systemUserInfoVo.setName(systemUser.getName());
        systemUserInfoVo.setAvatarUrl(systemUser.getAvatarUrl());
        return systemUserInfoVo;
    }

}
